ejector modeling

François_K · November 25, 2010, 07:49

Hi!
I'm currently trying to model an ejector, but it seems that my results doesn't convergence, and I have not idea why.
My basic parameters are:
Solver=density based
Viscous=k-epsilon
I have two inlets: gas pressure inlet (T=1500K;P=5000000Pa)
air pressure inlet (T=300k; P=101325Pa)
If someone has any idea to help me ....
Thanks

François_K · December 6, 2010, 11:53

I'm managed to convergence my problem, but without using the temperature data (1500K).
Now I'm trying to insert it in my problem, but it seems that fluent ignores my temperature's data. I'm using an ideal gas to modelize my compressible flow.
I mean I managed to solve the problem with the energy's equation disabled, and when I turn it on to consider the temperature the solution diverges (even if I try to decrease my UFR)
Someone knows where it can come from?

François_K · December 16, 2010, 10:55

Hi!
I managed to solve my problem, but now I noticed that a shock wave occurs in the diverging part of my ejector.
I probably should modify my geometry but I don't know how?
Someone has ideas to avoid this phenomenon?
Thanks

Contours of the Mach number
http://imagik.fr/view-rl/339651

goami · December 29, 2011, 15:05

Quote:

Originally Posted by François_K

I'm managed to convergence my problem, but without using the temperature data (1500K).
Now I'm trying to insert it in my problem, but it seems that fluent ignores my temperature's data. I'm using an ideal gas to modelize my compressible flow.
I mean I managed to solve the problem with the energy's equation disabled, and when I turn it on to consider the temperature the solution diverges (even if I try to decrease my UFR)
Someone knows where it can come from?

bro i am working on the same problem, i need a flow ckoking at the throat of my ejector but couldn't figure out how to interpret the pressure ratio in the fluent. and also i am using k-omega model and a 3d grid . the primary nozzle is fixed with a movable spindle to induce shock but i am not getting it. in this i took
species transport, eddy dissipation, volumetric.........always divergence in AMG SOLVER, temperature, pressure correction , omega......please help me.....i'll be waiting for your early reply becoz it's very much

urgent.....urgent............

markceciltano · September 26, 2014, 10:43

Hello Francois,

I'm working with the same ejector problem as you. Still, I can't get the simulation to converge. Can you please help me with the initial settings? It would be better if can take a look on your settings. You can email me at markc_tano@yahoo.com .. Any help will be greatly appreciated. Thanks

wadoud31 · December 5, 2018, 14:45

hi,
did you solve tour problem

November 25, 2010, 07:49	ejector modeling	#1
François_K New Member François Join Date: Nov 2010 Posts: 3 Rep Power: 16	Hi! I'm currently trying to model an ejector, but it seems that my results doesn't convergence, and I have not idea why. My basic parameters are: Solver=density based Viscous=k-epsilon I have two inlets: gas pressure inlet (T=1500K;P=5000000Pa) air pressure inlet (T=300k; P=101325Pa) If someone has any idea to help me .... Thanks

December 6, 2010, 11:53		#2
François_K New Member François Join Date: Nov 2010 Posts: 3 Rep Power: 16	I'm managed to convergence my problem, but without using the temperature data (1500K). Now I'm trying to insert it in my problem, but it seems that fluent ignores my temperature's data. I'm using an ideal gas to modelize my compressible flow. I mean I managed to solve the problem with the energy's equation disabled, and when I turn it on to consider the temperature the solution diverges (even if I try to decrease my UFR) Someone knows where it can come from? Last edited by François_K; December 7, 2010 at 09:03.

December 16, 2010, 10:55		#3
François_K New Member François Join Date: Nov 2010 Posts: 3 Rep Power: 16	Hi! I managed to solve my problem, but now I noticed that a shock wave occurs in the diverging part of my ejector. I probably should modify my geometry but I don't know how? Someone has ideas to avoid this phenomenon? Thanks Contours of the Mach number http://imagik.fr/view-rl/339651 goami likes this.

September 26, 2014, 10:43	Need help	#5
markceciltano New Member Mark Cecil Tano Join Date: Aug 2014 Posts: 2 Rep Power: 0	Hello Francois, I'm working with the same ejector problem as you. Still, I can't get the simulation to converge. Can you please help me with the initial settings? It would be better if can take a look on your settings. You can email me at markc_tano@yahoo.com .. Any help will be greatly appreciated. Thanks

December 5, 2018, 14:45		#6
wadoud31 Member wadoud Join Date: Nov 2010 Posts: 67 Rep Power: 16	hi, did you solve tour problem